Adding a race or two at the end of your season can be fun, but you have to do it right.
Leo Lightner started running in his 50s and now competes in marathons and ultramarathons.
Her record-setting time came 10 years ago this month.
Cancellation comes after a runner died during last week's half-marathon.
Deena Kastor is ranked second.
Patrick Makau and Edna Kiplagat are at the top of the list.
Fast times are expected as a result.
The famous marathon will be broadcast live again.
Brett Gotcher and Nick Arciniaga lead the way on the men's side.
He perished in a car accident.